FUEL ECONOMY LUBRICATING OIL COMPOSITION FOR LUBRICATING DIESEL ENGINES

摘要

A lubricating oil composition for internal combus-tion engines comprising a base oil having and lubricating viscosity and additives composed of a) a salt of an alka-li metal or alkaline earth metal and an alkylsalicylate and/or an alkylcarboxylate, b) a nitrogen atom-containing ashless dispersant and/or a nitrogen atom-containing dispersive viscosity index improver, c) a neutral salt of a fatty acid and a fatty amine, and d) oxidation inhibi-tor, is effective for lubricating diesel engines using a low sulfur-content fuel, even though it has a low sul-fated ash content, a low sulfur content and a low phosphorus content.